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<head>
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    <title>Document</title>
    <style>
        ul{
            list-style:none;
            width: 600px; 
            margin-left: auto;
            margin-right: auto;
            background: pink;
            line-height: 50px;
        }
        li{
            width: 200px;
            float: left;
            text-align: center;
        }
        a{
            text-decoration: none;
            color: black;
        }
        .drop-down{
            position: relative;
        }
        .drop-menu{
            position: absolute;
            display: none;
            width: 200px;
            background: deeppink;
        }
        .drop-menu a{
            display: block;
        }
        .drop-down:hover .drop-menu{
            display: block;
        }
        .row::after{
            content: "";
            display: table;
            clear: both;
        }
    </style>
</head>
<body>
    <ul class="row">
        <li class="drop-down">
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